The “Dark Side”……..

Just went through one of those “ugly” break-ups. Before I was aware of the intentions of my now “ex”, my computer was completely vulnerable with no safe guards of any kind. I have very strong suspicions of less than honorable activity on my computer such as web cam and IM just for starters. Is there a way of recovering activities such as chat or file transfers via the internet even though they may have been deleted short of professional recovery or third party software?
Thanx